For better or worse, FR doesn't seal that area very well, there's considerable circulation, especially when moving which is when most of our charging gets done. Considered putting in a small fan to ventilate when charging, but in the end figured it wasn't needed. YMMV.

A couple of thoughts on battery gassing, but remember that I am not a flooded lead acid (fla) battery engineer, nor do I pretend to be one on blogs.

Most gassing occurs near the end of a high rate charge when available current exceeds that usable in converting lead sulphate on the plates. The excess turns into heat, which causes its own problems, and electrolysis that generates hydrogen and oxygen.

Modern 3 stage chargers used in our trailers greatly reduce excess current by first reducing rates as batteries reach about 80% of charge, then reducing again to provide a lower voltage low current float at 100% to maintain full charge. That eliminates most of the excess current that would otherwise be diverted into heat and electrolysis. It seems that will greatly reduce, but not eliminate, gassing. Also, the line voltage charger on my trailer includes a fan that will increase circulation in the under bunk compartment where the batteries are. Modern smart chargers are not the crude beasts we had years ago that would cook batteries and generate copious amounts of hydrogen if left to their own devices.

The 12v charging provided by the TV is a different critter and I need to read a little more about it. While I expect it varies from TV to TV, in general the size of the fusing and wiring between TV and TT lets us know the charging current available is limited. Also seems likely there's a diode in line to prevent the trailer batteries from trying to dump all their current back through the cabling to the TV starter motor. That will knock a half volt or so off the voltage available to drive trailer battery charging. As I noted originally, FR did not seal that area particularly well, so TT battery charging from the TV that happens mostly while moving will have some air circulation.

So there you have it, FWIW, my logic for having moderate concerns about gassing with fla batteries and a 195BH.

It takes a little 1/2 inch Pex, a couple of Ls to go from vertical to horizontal, clamps and adapters to go from Pex to shut off valves. I reused the drain valve that was on the pipe already. A small conduit to I beam bracket provided an easy way to attach to the frame.

Then there was the note taped to the frame to keep me from forgetting which pipe was which. Dunno about this getting old stuff.

Our tire size changed from 205/75x14 to 215x75Rx14. Rims are 14"; and did not change. New tires are also 14". Tire diameter went up from 26.1" to 26.7". We like the wider tread width of 8.5", and more than anything else radial and higher quality vs the original bias ply tires.

Why do you want to move to a 15" wheel? A 205x75Rx15 tire would be 27.1" in diameter and have an 8.1" wide tread.

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